What does it mean when someone makes you warm and fuzzy inside?

This is something I've been thinking about for a while. There are some girls that just turn me on when I'm around them, but there are others where being around them and talking to them is fulfilling and makes me feel warm and fuzzy inside.

Why do I feel differently about these two types of girls and what does it mean?
What does it mean when someone makes you warm and fuzzy inside?
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